installing network service dll (vmnetbridge.dll) fails to copy into system32

[qa4ever]

Trying to install a network service vmnetbridge.dll fails with err msg. "An
error occured while copying file vmnetbridge.dll. Cannot copy file to
destination directory. c:\windows

User is in local admin group.

UAC is set to OFF.

Driver is digitally signed by Vmware, inc.

Please advice how to rectify.
QA4Ever